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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
Hi all. Just found this really nice photo on laserpointerforums.
Seems that someone was a bit careless when decanning a diode (looks like a 405, possibly a 445 )
Had that happen to me once with a 940? nm cd write laser. In this case the actual semiconductor came apart into two halves! can sometimes happen with overdriven PS3 diodes as well.
Feel free to add to this thread with pics of laser related oopses.
EDIT:- I've had diodes die due to overheating before, in my case it was a £40+ decanned HD-DVD drive laser. Ran it in an aixiz but evidently the heat buildup at 72mA caused it to run away and cook. Module was at about 70C (hot to the touch) when it COD'd.
Registered Member #2063
Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
Grenadier wrote ...
Traded tritium for a 445 diode, got it in the mail and blew it up all of 10 minutes later.
That is why I don't build diode lasers...
NEVER power up a laser diode without a driver. laser diodes run on current, but sometimes you can't have the current without raising the voltage and if you raise the voltage, the current might get too high and deep fry your diode. drivers are suppose to limit the current and protect your diode.
how mant watts was the diode that you traded for? If anything lower than 1000mW I'd rather keep the tritium. atleast they ligh up for 10 years right? and they're cool to have too, how often do you radioactive material aroud?
Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
Grenadier wrote ...
Diode died instantly, no heat to be found. My driver must've been dead or something.
Meh, nothing I can do now anyways.
So did you use a heatsink or you didnt? What kind of driver did you use for the diode?
btw, the 445 diodes, the A-140/150 series of them can do 2W with good heatsinking. The A-130's (now discontinued I hear) have a slightly lower wavelenth, and are less efficient so they have a lower output. Remember.. heatsinks are your friends...
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
3W 808's are fairly common now, see
I believe that 10W blue are in the pipeline as the blue-green conversion is more efficient than 808-1064-green so they have dual application as projector light sources and general purpose spot lighting.
I also discovered something interesting, lasers can be used to make pretty good ready polarised illuminators for microscope+webcam applications. (DO NOT USE with conventional microscopes!!!!)
Also another amusing application is to couple a red or blue write diode to an optical fibre bundle and make a high efficiency backlight for LCD use.
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Add your laser fail here...
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